Vocabulary
an object that produces a magnetic field and attracts certain materials
What is a magnet?
Iron, nickel, and cobalt
What are the 3 metals that magnets are attracted to?
To show this type of force between two bar magnets, you must place like poles (N-N or S-S) facing each other
What is repulsive?
As the distance between two magnets increases, the magnetic force will do this
What is decreases?
The main function of a speaker: converting electrical signals into this
What are sound waves?
a type of magnet that maintains its magnetic properties pretty much all the time
What is a permanent magnet?
This is what happens to a coil of wire when an electric current runs through it
What is, becomes an electromagnet and has a magnetic field around it?
Draw two magnet with opposite poles facing each other and describe whether they attract or repel each other.
What is attract?
The way to increase the magnetic force between two magnets.
What is bring them closer to each other?
In a speaker, this part vibrates back and forth to push the air and produce sound waves
What is the cone?
the 3-dimensional area around a magnet where its force can be detected? The direction this force moves out of and around the magnet
What is a magnetic field?
What is from the north pole to the south pole?
Copper, aluminum, or gold are examples
What are metals that are not attracted to magnets?
The convention for the direction of a magnetic field is that the lines point out of this pole and into the this pole
What is out of the north pole and into the south pole?
The strength of an electromagnet when more batteries are added to the system?
What is increases?
This is the interaction between the electromagnet (coil) and the permanent magnet that causes the push-and-pull motion in a speaker
What is the alternating attraction and repulsion (or, the changing magnetic field interaction)?
the force interaction that occurs between opposite poles of magnets,
and, a diagram of it with 2 bar magnets
What is attraction?
This naturally occurring rock is an example of a permanent magnet that attracts iron
What is lodestone?
A paperclip sitting in a magnetic field has potential energy. When we move the magnet closer, the potential energy turns into kinetic as the paperclip moves toward it. Give another example of a magnet transferring energy to an object and making it move.
What is a magnet pulling on an iron nail?
The one variable that a scientist changes in an experiment.
What is the independent variable?
The flow of electric current through the coil makes it this type of magnet, whose poles can rapidly switch direction
What is an electromagnet?
this force surrounds a copper wire when electricity runs through the wire, and, what we do to the wire to strengthen the force
What is magnetism?
What is coil it?
A fundamental natural force that we have just been studying, that acts at a distance (not a life force)
What is magnetism?
One of two things you could do to make an electromagnet and a permanent magnet attract each other if they are currently repelling
What is reversing the direction of the electric current in the electromagnet OR flipping the permanent magnet so the opposite pole is facing the electromagnet?
For an experiment, if a student wanted to test the effect of increasing the number of coil wraps on the strength, two variables they would have to keep constant are
What is the type of battery, the type of wire, and the technique they use to measure the strength?
Three other examples of technologies, besides a speaker, that utilize magnets
What are an MRI machine, a Maglev train, a credit card strip, a hard drive, a doorbell, or a refrigerator seal? (Any three correct examples)